Thursday, April 7, 2011

clunking noise from rear side at low speed on Chevrolet HHR?

#PI0158: Intermittent Tapping or Clunk Noise from Rear at Low to Moderate Speeds During Light to Moderate Brake Apply (Refinish Rear Brake Drums) - (Jun 21, 2010) .

Subject: Intermittent Tapping or Clunk Noise from Rear at Low to Moderate Speeds During Light to Moderate Brake Apply (Refinish Rear Brake Drums)

The problem is noticed in
Models: 2006, 2007 and 2010 Chevrolet HHR .

The following procedure may be helpful if the vehicle exhibits the symptoms described in this PI.

Condition/Concern
• Some customers may comment on an intermittent tapping noise coming from the rear of the vehicle upon applying the brakes when driving between 35-40 mph (56-64 km/h).

• They may also comment on an intermittent clunk noise coming from the rear of the vehicle during a light to moderate brake apply at speeds of 10 mph (16 km/h) or less.

• These conditions may be caused by brake drums that are out of round.

Recommendation/Instructions
Important: DO NOT replace the brake drums. Refinish both of the brake drums.

Test drive the vehicle and verify that the above condition or conditions exist as described.
⇒ If either condition exists as described, proceed to Step 2.

Raise and support the vehicle. Lifting and Jacking the Vehicle is required.
Remove both tire and wheel assemblies.


Remove the brake drums.
Refinish the brake drums.
Note: Failure to clean any existing corrosion from the wheel hub flange mating surface may result in increased lateral runout of the brake drum and brake system pulsation.

Clean the wheel hub flange mating surface of any corrosion.
Install the brake drums.
Install the tire and wheel assemblies.
Lower the vehicle. Test drive the vehicle and verify that the concern has been corrected.
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This problem is faced by many other users too.But its still not declared as recall problem.But getting this procedure done by dealer or professional auto store is advisable.As they will have all required tools to complete this brake drum refinishing procedure.------